| 摘要 |
PURPOSE:To prevent outdoor noises from entering a room, by detachably mounting a filter to a ventilating fan in such a way that the filter is located to interrupt an air current path between a draft opening having a sound screening member and a bellmouth opening. CONSTITUTION:A filter 5 is detachably attached to a sound screening member 6, and the filter 5 is located to interrupt the air current path between the opening of a bellmouth 4 and the draft opening 7 of the screening member 6. According to this arrangement, outdoor noises would be interrupted to enter the room and therefore the noises are prevented from entering the room. |
